import java.util.*;
  public class Example3_9 {
   public static void main (String args [ ]) {
    Scanner reader= new Scanner(System.in);
    double sum=0;
    int m=0;
    while(reader.hasNextDouble()) {
     double x=reader.nextDouble();
     m=m+1;
     sum=sum+x;
    }
  System.out.printf("%d的个数是%f\n",m,sum);
  System.out.printf("%d个数的平均值是%f\n",m,sum/m);
}
}

